package com.example.demo.config;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

import java.util.HashMap;

/**
 * @author vivi
 * @description
 * @date 2024/5/31
 */
@ControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice {

    @Autowired
    private ObjectMapper objectMapper;

    // 此方法返回 true， 则执行下面的 beforeBodyWrite 方法
    @Override
    public boolean supports (MethodParameter returnType, Class converterType) {
        return true;
    }

    @Override
    public Object beforeBodyWrite (Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        HashMap<String, Object> result = new HashMap<>();
        result.put("code", 200);
        result.put("msg", "");
        result.put("data", body);
        if (body instanceof String) {
            // 需要特殊处理
            try {
                return objectMapper.writeValueAsString(result);
            } catch (JsonProcessingException e) {
                throw new RuntimeException(e);
            }
        }
        return result;
    }
}
























